Rotary-reciprocating drill



Filed Nov. 19 1921 R BINNIE ROTARY RECIPROCATING DRILL all? I 3 m QM \m Q Ii t S r; dm u June 10, 1924.

// VENTOE Patented June 10, 1924. u

PATENT QF HTED STATE ROBERT BINNIE, OF BOLIVARI, PENNSYLVANIA.

ROTARY-RECIPROCATING DRILL.

Application filed November 19, 1921. Serial No. 516,325.

To all whom it may concern.

Be it known that I, ROBERT BINNIE, a citizen of the United States, and a resident of Bolivar, in the county of VVestmoreland and State of Pennsylvania, have invented a new and useful Improvement in Rotary-Reciprocating Drills, of which the following is a specification. I

This invention relates to drills and particularly to rotary-reciprocating drills of the type used for drilling rock and other similar materials.

It is an object of the invention to provide a drill of the type referred to in which substantially all the means for mounting and operating the drill rod are either located below or in alignment with the rod so as to render the device especially adapted for overhead work'in tunneling and under other similar crowded circumstances.

It is also an object to provide a device in which the reciprocating drill rod is 2 given sharp hammer blows near the extremities of its stroke in both directions. It is a further object to provide a device which will be simple, compact, cheap to manufacture, efiicient in operation, in which the intensity of the impacts can be regulated during use, in which the movement of the hammer is cushioned after the blows are delivered and in which such cushioning action tends to' move the drill rod lengthwise.

In the accompanying drawings Fig. 1 is' a vertical'sectional view with parts in elevation of one embodiment of the invention;

Fig. 2 a transverse sectional view taken on' the line IIII of Fig. 1: and. Fig. 3 an enlarged detailed view of thehammer mechanism mounted on a drill rod of modified construction.

As illustrated. the guide frame 1 is provided with suitable nieans 2 for attaching it to a supporting standard 3. Mounted for sliding movement in the guiding slot 1 'of' frame 1 is a lug 5 depending from the cas-' ing 6. Fixed in the lug 5 is a nut 7 with which screw 8 cooperates to move the easing 6 towards and from thematerial oper- One end of the casing is provided with a split bearing 12 having a threaded or split flanged bushing 13, and journaled in an inwardly extending boss 14. in the opposite end is the sleeve of a worm gear 15, the, same being held in place by a nut 16 threaded upon its outer end and fitting within an annular groove 17 so as to lie flush with the exterior of the casing. The gear is provided with a non-circular axial bore in which slides the correspondingly shaped inner end 18 of drill rod 19, the said rod being slidably mounted in the gear 15 and the bearing 12 which is in alignment therewith.

The drill rod 19 is provided with a pair of spaced abutments 20 and21, the former being integral-with the drill rod in the embodiment shown in Fig. 1, or may be in the form of a collar 20 abutting a shoulder 22 on the rod as illustrated in Fig. 3, while the latter is in the form of a split collar fitting in an annular groove 23 and has its sections bound together by any suitable means as indicated at 24;.

Mounted for sliding movement upon the rod 19 and between the abutments 20 and 21 is a hammer indicated as a whole by'the numeral 25. This hammer comprises the sleeve 26 having the integrally formed enlargement 27at one end and the removable enlargement 28 threaded upon its opposite end. One end. of a connecting rod 29 rockably and slidably engages the hammer by encircling the sleeve 26 which passes through an aperture 30 formed therein, the said end being provided with a skirt 31 for housing a compression spring 32 disposed between the enlargement 27 and the connecting "rod. Abutti'ng the rod 29 opposite the spring 32 is a slidable washer or collar 33 between which and the enlargement 28 is located the compression spring 34.

The inncr end of the connecting rod is attached to the crank 35 of a shaft 36 journaled in the'sides of the casing 6 by means of the yoke 37 and block 38, the shaft beingalso provided intermediate its ends with a worm 39 meshing with the gear 15, and at one end with the sprocket gear 40 driven by a chain 41 engaging a sprocket wheel 42 The outer end of the drill rod has attached theretoa chuck 44 provided with slots 45 in which pins 46 projecting from. the bit-4:7

the same during its backward stroke. forcing the caslng 6 towards the work so as engageso as to prevent turning movement of the bit within the chuck, a pair of such pins and slots being preferably provided, and disposed between the chuck and bushing 13 is a spiral spring 48 normally urging the bit outwardly.

The distance between the abutments and 21 is greater than the length of the hammer 25 but such distance is somewhat less than the stroke thereof, resulting in an impact between the ends of the hannner and the respective abutments as said hammer approaches the ends of its movement in either direction.

In operation, power is applied through gears 42, and chain 41 to shaft 36 which causes rotation of gear 15 and reciprocation of the connecting rod 29. Due to the slidable but non-rotatable connection between the gear 15 and portion 18, the drill rod is rotated. Movement of rod 29, which is free to rock upon the sleeve 26, causes the'hammer 25 to reciprocate. Assuming the parts to be in the positions shown in Fig. 1, and the hammer to be moving towards the right, the same will slide freely upon the rod '19 until the enlargement 28 strikes the abutment 20 or 20 after which further movement of connecting rod 29 will compress the spring 3i and thus cushion the remainder of its stroke, but at the same time constantly urge thedrill bit into the material operated upon. During the return movement of the hammer towards the left the spring 34: first expands until the connecting rod is centered. Further movement towards the left merely slides the hammer freely upon the rod 19 until the connecting rod approaches the end of its stroke when enlargement 27 is brought into contact with the abutment 21 giving it a sharp blow, after which the spring 32 is compressed similarly to .the spring 3 as previously described. As the bit 437 cuts away th material operated upon, casing 6 together with its attached parts is gradually moved towards the same by the turning of crank 9 and screw 8.

WVith the construction described not only the advantages incident to the use of an impact hammer are secured without danger of throwing undue strains upon it, due to the cushioning action of springs 32 and '34, but the drill rod is also normally reciprocated subsequent to the impacts under the tension of such springs, the drill bit being urged forwardly by spring 34 as the material gives way under it during the forward stroke and is normally urged 'backwardly to fig-3e to vary the compression of spring 48 the abutment 20 is made to approach the enlargement 28 of the hammer to a greater or less extent and thus-vary the driving impact delivered thereby, as is found desirable.

Similarly by exerting a greater pressure upon the casing to withdraw the bit, the impacts delivered during the backward strokes of the hammer may .be regulated.

The provision of a casing with a split bearing 12 enables the parts to be easily as sembled when a drill rod provided with the integral abutment 20 is used, and all parts housed within the casing are readily accessible through the door 11 covering substantially the entire top thereof. Furthermore by disposing all the driving parts below the drill rod and the motor to the rear of the casing no obstructing parts project above the said rod enabling the drill to :be effectively used in overhead work in tunneling since the casing may be placed adjacent the ceiling while still maintaining the drill bit in a substantially horizontal position.

It is-thus seen that the invention provides a very compact, simple and efficient device and one having the advantages of :bOth a rotary-reciprocating and hammer .drirll.

I claim:

1. A drill comprising a casing, a drill rod mounted therein, .a pair of spaced abutments on said rod, a reciprocating hammer adapted to strike said abutments near the .oppo site ends of its stroke and means for reciplocating the hammer having a yieldingconnection therewith.

2. A drill comprising a casing, a .drill rod mounted therein, a pair ofspaced abutments or said rod, a reciprocating hammer slidably mounted on the rod and adapted to strike said abutments near the extremities of its stroke, means for reciprocating .the ththlnlllfil, and a spring interposed in the operative connection of the said means and hammer.

3. A drill comprising a casing, a drill rod mounted therein, a pair of spaced abutments on said rod, a hammer sleeve slidable on the rod between the abutments and adapted to strike the abutments near the ends of its stroke, a connecting rod for reciprocating said sleeve and having a yieldable connec tion therewith.

4. A drill comprising a casing, a drill rod mounted therein provided with an abutment, a removable collar fitting in a groove in the rod and spaced from the abutment, a :hammer sleeve slidably mounted on the rod be tween the said abutment and collar, enlargements at the opposite ends of the sleeve, a connecting rod having its end .slidably connected with the sleeve and springs interposed between the said end and the enlargements, the hammer sleeve striking the abutment and the collar near the extremities of its stroke.

5. Adrillcomprising a casing, a drill rod mounted therein provided with an abutment, a removable split collar fitting in a groove in the rod forming a second abutment spaced from the first abutment, a hammer sleeve slidably mounted on the rod between the abutments, enlargements fixed to the opposite ends of the sleeve, a connecting rod formed with an apertured end encircling the sleeve and having slidable and rocking movement thereon, springs interposed between said apertured end and said enlargements, the hammer sleeve striking the abutments near the extremities of its stroke.

6. A drill comprising a guide frame, a casing slidable thereon, a split bearing at one end of the casing, a gear provided with a non-circular bore journaled in the opposite end of the casing, a drill rod provided with a pair of spaced abutments mounted in the bearing and the bore of the gear, one of said abutment's being integral with the rod and the extremity of the rod mounted in the gear conforming in cross section to its bore so as to be longitudinally slidable but nonrotatable therein, a reciprocating hammer slidable on the rod between the abutments, a connecting rod operatively engaging the hammer, means for reciprocating said connecting rod and driving said gear, said means and rod being disposed between the drill rod and guide frame, and a motor in alignment with the drill rod and casing for actuating said means. 7

In testimony whereof, I sign my name.

ROBERT BINNIE. 

